Error trying to load up a kml

I’m not sure if this is the correct location. I’m using Ardupilot Mission Planner Version 1.3.82, I’ve also tried the latest 1.3.899.

I go into Plan, then Map tool and KML Overlay. I then choose one of my KML’s. I’ve never had an issue until today.

I get the following message on the screen.

Anyone else having the same issue or can someone help me out?

Thanks in advance